CATALOGUE. 167 or two high, tomentose-canescent;. somewhat naked with age: leaves nar¬ rowly linear, entire, minutely punctate: heads solitary on filiform peduncles terminating the branches: akenes glabrous: pappus of oblong erose- laciniate chaffy scales, about a quarter the length of the glandular disk corolla." Not having the specimen, I have been obliged to quote the above ii-om Fl Cal 1, p. 373. Arizona. RiDDELLiA tagetina, Nutt —^A foot high, floccose-woolly or smoother with age, much branched; leaves sessile, narrowly spatulate or oblanceo¬ late, 8-18" long; heads in clusters on the ends of the branches; scales of the pappus entire, about (or more than) half as long as the tube of the disk- flowers; rays somewhat puberulent externally.—Camp Bowie, Ariz. (463), and Alcadonis, N. Mex. (82). Ch-^nactis Douglasii, Hook. & Arn.—Colorado, about South Park (481, 482) ; also from Nevada and Utah. Ch^nactis stevioides, Hook. & Arn.—Independence Valley, Nevada. Hymenopappus luteus, Nutt.—Arizona, Colorado, and New Mexico. Hymenopappus flavescens. Gray (Pl. Fendl. p. 97).—Leaves less dis¬ sected and divisions larger than in the following variety, in which the flowers are a real yellow.—A somewhat variable species. Colorado. Hymenopappus canescens, var. cano-tomentosus, Gray (Pl. Wright. 2, p. 94, and Pl. Fendl. p. 97).—Erect, floccose-tomentose; leaves bipinnately parted; segments 3" long and J" wide; inflorescence in a cymose panicle; heads 4" in diameter; scales of the involucre with petaloid and somewhat scarious tips ; chaff of the pappus entire, oval, one-half or one-third as long as the tube of the corolla; achenia turbinate, obscurely 3-5-angled, 15- nerved, villose.—Western New Mexico, Loew. BiHiA LEUCOPHYLLA, DC.—Nevada. B.4HIA absinthifolia, Benth., var. dealbata. Gray.—Erect, branch¬ ing from a sub-ligneous root, canescent-tomentose ; leaves oblong, trifid at base, with middle division often toothed toward the apex or entire, linear-lanceolate obtuse; heads, including the rays, 8" in diamet-er; invo- Style-branches of the disk-flowers short, truncate-capitate at tho apex. Akenes narrow, terete or nearly so, obscurely striate or angled, glabrous, or in one species cobwebby-villous. Pappus of 4 to (3 hyaline nerveless and pointless chaffy scales.—Low and branching woolly herbs, probably all perennial; with alternate, spatulate or linear leaves, either entire, or the radical ones pinnately ineiaod, and corymbose small heads of golden yellow flowers."—Gray, Fl. Cal. 1, p. 372.